I've had some requests for explanation, so here ya go:
Murderball has four players on the court for each team. two Defensemen and two attack players. The attack player's objective is to capture the "balls", which are known commomly as chips. If you can see the red bricks the players are carrying, those are the chips. The objective is to get all four chips to your team's endzone for an entire minute without the chips leaving the endzone. Hitting football style is the regular way of stopping an opposing player.